Does Mark Hyman recommend Vitamin D?
Yes — Mark Hyman has directly recommended Vitamin D.
Published research rates it moderate evidence. Of Mark Hyman's 18 tracked claims, 0 are supported or partially supported by studies on PubMed.
Evidence last reviewed May 2026
Mark Hyman on Vitamin D — 18 claims
“if you want to be a vegetarian no problem make sure to check your homosysteine and your vitamin D and things like that”
Vegetarians following a brain-healthy diet should check their vitamin D levels (among other markers like homocysteine).
None of the 20 provided studies directly address the recommendation for vegetarians following a brain-healthy diet to monitor vitamin D levels or homocysteine. While several studies (PMIDs 33237064, 1…
“if you want to be a vegetarian no problem make sure to check your homosysteine and your vitamin D and things like that”
Vegetarians following a brain-healthy diet should check their vitamin D levels (among other markers like homocysteine).
“the study that just came out about 10 days ago showing if you take the people who are low in vitamin D they have a much worse outcome in covid-19 than the people who have sufficient vitamin D”
Low vitamin D is associated with worse outcomes in COVID-19 compared to people with sufficient vitamin D levels, according to a recent study.
“people who are low in vitamin D more likely to get Alzheimer's people who are sufficient vitamin D”
People who are low in vitamin D are more likely to get Alzheimer's disease.
“same thing in multiple sclerosis high vitamin D associated with better outcomes”
High vitamin D levels are associated with better outcomes in multiple sclerosis.
“the study that just came out about 10 days ago showing if you take the people who are low in vitamin D they have a much worse outcome in covid-19 than the people who have sufficient vitamin D”
Low vitamin D is associated with worse outcomes in COVID-19 compared to people with sufficient vitamin D levels, according to a recent study.
None of the 20 published research items provided address the relationship between vitamin D status and COVID-19 outcomes. The available studies cover vitamin D in contexts such as cardiovascular event…
“people who are low in vitamin D more likely to get Alzheimer's people who are sufficient vitamin D”
People who are low in vitamin D are more likely to get Alzheimer's disease.
None of the 20 published research abstracts provided address the relationship between vitamin D deficiency and Alzheimer's disease risk. The studies cover vitamin D in contexts such as cardiovascular…
“same thing in multiple sclerosis high vitamin D associated with better outcomes”
High vitamin D levels are associated with better outcomes in multiple sclerosis.
None of the 20 published research summaries provided addresses multiple sclerosis (MS) or the association between vitamin D levels and MS outcomes. While several studies examine vitamin D supplementat…
“there's type two which is atrophic and these are the people where they have low vitamin D pregnenolone progesterone estradiol testosterone you know on and on the critical supports for this nerve growth factor brain derived neurotrophic Factor B12”
In the atrophic type (type two) of Alzheimer's, low vitamin D is one of the key deficiencies to look for alongside low pregnenolone, progesterone, estradiol, testosterone, nerve growth factor, BDNF, and B12.
“loss of nutrients like vitamin D uh loss of ngf or bdnf brain derived neurotrophic Factor these are all critical for keeping your brain functioning optimally”
Vitamin D is among the critical trophic/nutritional factors whose loss contributes to brain decline and is important for keeping the brain functioning optimally.
None of the 20 studies provided directly address vitamin D's role in brain function, cognitive decline, or neurological health. The closest relevant study (PMID: 37603263) reviews over-the-counter sup…
“there's type two which is atrophic and these are the people where they have low vitamin D pregnenolone progesterone estradiol testosterone you know on and on the critical supports for this nerve growth factor brain derived neurotrophic Factor B12”
In the atrophic type (type two) of Alzheimer's, low vitamin D is one of the key deficiencies to look for alongside low pregnenolone, progesterone, estradiol, testosterone, nerve growth factor, BDNF, and B12.
None of the 20 studies provided address Alzheimer's disease subtypes, the 'atrophic type two' classification framework, or the specific panel of deficiencies (pregnenolone, progesterone, estradiol, te…
“loss of nutrients like vitamin D uh loss of ngf or bdnf brain derived neurotrophic Factor these are all critical for keeping your brain functioning optimally”
Vitamin D is among the critical trophic/nutritional factors whose loss contributes to brain decline and is important for keeping the brain functioning optimally.
“in Alzheimer's it's more likely to be things like MotoX sins or reduced vitamin D or reduced hormonal support or ngf or bdnf things like that”
Reduced vitamin D is one of the factors in Alzheimer's disease that is more likely to be causal compared to other neurodegenerative diseases.
“in Alzheimer's it's more likely to be things like MotoX sins or reduced vitamin D or reduced hormonal support or ngf or bdnf things like that”
Reduced vitamin D is one of the factors in Alzheimer's disease that is more likely to be causal compared to other neurodegenerative diseases.
None of the 20 published research articles provided address the relationship between vitamin D deficiency and Alzheimer's disease or neurodegenerative disease causality. The studies cover topics such…
“she had initially had a lot of a type two reduced estradiol progesterone no surprise she was 73 reduced vitamin D poor thyroid all those so all those were addressed um she then improved and she actually went from nine so she was in the ninth percentile on her initial cognitive scores she's now at the 97th percentile”
A patient with cognitive decline had reduced vitamin D (among other deficiencies), which was addressed as part of a comprehensive functional medicine approach, resulting in dramatic improvement in cognitive scores.
“she had initially had a lot of a type two reduced estradiol progesterone no surprise she was 73 reduced vitamin D poor thyroid all those so all those were addressed um she then improved and she actually went from nine so she was in the ninth percentile on her initial cognitive scores she's now at the 97th percentile”
A patient with cognitive decline had reduced vitamin D (among other deficiencies), which was addressed as part of a comprehensive functional medicine approach, resulting in dramatic improvement in cognitive scores.
None of the 20 listed studies directly evaluate vitamin D supplementation as part of a comprehensive functional medicine protocol for cognitive decline or cognitive score improvement. The review on ov…
“you look at all your nutritional status right the B vitamins vitamin D vitamin E magnesium zinc copper CoQ10 lipoic acid Omega-3s”
Vitamin D is one of multiple nutrients checked as part of a comprehensive functional medicine assessment for cognitive decline, alongside B vitamins, vitamin E, magnesium, zinc, copper, CoQ10, lipoic acid, and omega-3s.
“you look at all your nutritional status right the B vitamins vitamin D vitamin E magnesium zinc copper CoQ10 lipoic acid Omega-3s”
Vitamin D is one of multiple nutrients checked as part of a comprehensive functional medicine assessment for cognitive decline, alongside B vitamins, vitamin E, magnesium, zinc, copper, CoQ10, lipoic acid, and omega-3s.
The expert's claim describes a multi-nutrient panel (vitamin D, B vitamins, vitamin E, magnesium, zinc, copper, CoQ10, lipoic acid, omega-3s) used in functional medicine assessments for cognitive decl…
Other supplements Mark Hyman discusses
Claims are extracted from publicly available podcasts and videos, attributed to their source, and compared against PubMed research. This is educational information only — consult a healthcare provider before starting any supplement.
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